Inject service in another service

Question

I have UserService and MissionService.

Is it ok to inject MissionService in UserSerivce or vice versa?

If yes, what about unit testing?

Answer 1

Of course you can and it is perfectly fine. But I recommend that you use method-injection in order to allow you to set the instance at runtime without using using reflection (you can create an instance manually).

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For example:

@Service public class MissionService { }  @Service public class UserService {     private MissionService missionService;      @Autowired     public void setMissionService(MissionService missionService) {         this.missionService = missionService;     } } 

This allows you to create both services using regular Java without Spring:

MissionService missionService = new MissioNService(); UserService userService = new UserService(); userService.setMissionService(missionService); 

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Caution: You have to take care of not building dependency cycles. It is not set that Spring resolves them, I think